/* http://keith-wood.name/countdown.html
   Countdown for jQuery v2.0.0.
   Written by Keith Wood (kbwood{at}iinet.com.au) January 2008.
   Available under the MIT (https://github.com/jquery/jquery/blob/master/MIT-LICENSE.txt) license. 
   Please attribute the author if you use it. */

(function($) { // Hide scope, no $ conflict

    var pluginName = 'countdown';

    var Y = 0; // Years
    var O = 1; // Months
    var W = 2; // Weeks
    var D = 3; // Days
    var H = 4; // Hours
    var M = 5; // Minutes
    var S = 6; // Seconds

    /** Create the countdown plugin.
        <p>Sets an element to show the time remaining until a given instant.</p>
        <p>Expects HTML like:</p>
        <pre>&lt;div>&lt;/div></pre>
        <p>Provide inline configuration like:</p>
        <pre>&lt;div data-countdown="name: 'value'">&lt;/div></pre>
        @module Countdown
        @augments JQPlugin
        @example $(selector).countdown({until: +300}) */
    $.JQPlugin.createPlugin({
    
        /** The name of the plugin. */
        name: pluginName,

        /** Countdown expiry callback.
            Triggered when the countdown expires.
            @callback expiryCallback */

        /** Countdown server synchronisation callback.
            Triggered when the countdown is initialised.
            @callback serverSyncCallback
            @return {Date} The current date/time on the server as expressed in the local timezone. */
            
        /** Countdown tick callback.
            Triggered on every <code>tickInterval</code> ticks of the countdown.
            @callback tickCallback
            @param periods {number[]} The breakdown by period (years, months, weeks, days,
                    hours, minutes, seconds) of the time remaining/passed. */

        /** Countdown which labels callback.
            Triggered when the countdown is being display to determine which set of labels
            (<code>labels</code>, <code>labels1</code>, ...) are to be used for the current period value.
            @callback whichLabelsCallback
            @param num {number} The current period value.
            @return {number} The suffix for the label set to use. */
            
        /** Default settings for the plugin.
            @property until {Date|number|string} The date/time to count down to, or number of seconds
                        offset from now, or string of amounts and units for offset(s) from now:
                        'Y' years, 'O' months, 'W' weeks, 'D' days, 'H' hours, 'M' minutes, 'S' seconds.
            @example until: new Date(2013, 12-1, 25, 13, 30)
 until: +300
 until: '+1O -2D'
            @property [since] {Date|number|string} The date/time to count up from, or
                        number of seconds offset from now, or string for unit offset(s):
                        'Y' years, 'O' months, 'W' weeks, 'D' days, 'H' hours, 'M' minutes, 'S' seconds.
            @example since: new Date(2013, 1-1, 1)
 since: -300
 since: '-1O +2D'
            @property [timezone=null] {number} The timezone (hours or minutes from GMT) for the target times,
                        or null for client local timezone.
            @example timezone: +10
 timezone: -60
            @property [serverSync=null] {serverSyncCallback} A function to retrieve the current server time
                        for synchronisation.
            @property [format='dHMS'] {string} The format for display - upper case for always, lower case only if non-zero,
                        'Y' years, 'O' months, 'W' weeks, 'D' days, 'H' hours, 'M' minutes, 'S' seconds.
            @property [layout=''] {string} Build your own layout for the countdown.
            @example layout: '{d<}{dn} {dl}{d>} {hnn}:{mnn}:{snn}'
            @property [compact=false] {boolean} True to display in a compact format, false for an expanded one.
            @property [padZeroes=false] {boolean} True to add leading zeroes
            @property [significant=0] {number} The number of periods with non-zero values to show, zero for all.
            @property [description=''] {string} The description displayed for the countdown.
            @property [expiryUrl=''] {string} A URL to load upon expiry, replacing the current page.
            @property [expiryText=''] {string} Text to display upon expiry, replacing the countdown. This may be HTML.
            @property [alwaysExpire=false] {boolean} True to trigger <code>onExpiry</code> even if target time has passed.
            @property [onExpiry=null] {expiryCallback} Callback when the countdown expires -
                        receives no parameters and <code>this</code> is the containing division.
            @example onExpiry: function() {
    ...
 }
            @property [onTick=null] {tickCallback} Callback when the countdown is updated -
                        receives <code>number[7]</code> being the breakdown by period
                        (years, months, weeks, days, hours, minutes, seconds - based on
                        <code>format</code>) and <code>this</code> is the containing division.
            @example onTick: function(periods) {
    var secs = $.countdown.periodsToSeconds(periods);
    if (secs < 300) { // Last five minutes
        ...
    }
 }
            @property [tickInterval=1] {number} The interval (seconds) between <code>onTick</code> callbacks. */
        defaultOptions: {
            until: null,
            since: null,
            timezone: null,
            serverSync: null,
            format: 'dHMS',
            layout: '',
            compact: false,
            padZeroes: false,
            significant: 0,
            description: '',
            expiryUrl: '',
            expiryText: '',
            alwaysExpire: false,
            onExpiry: null,
            onTick: null,
            tickInterval: 1
        },

        /** Localisations for the plugin.
            Entries are objects indexed by the language code ('' being the default US/English).
            Each object has the following attributes.
            @property [labels=['Years','Months','Weeks','Days','Hours','Minutes','Seconds']] {string[]}
                        The display texts for the counter periods.
            @property [labels1=['Year','Month','Week','Day','Hour','Minute','Second']] {string[]}
                        The display texts for the counter periods if they have a value of 1.
                        Add other <code>labels<em>n</em></code> attributes as necessary to
                        cater for other numeric idiosyncrasies of the localisation.
            @property [compactLabels=['y','m','w','d']] {string[]} The compact texts for the counter periods.
            @property [whichLabels=null] {whichLabelsCallback} A function to determine which
                        <code>labels<em>n</em></code> to use.
            @example whichLabels: function(num) {
    return (num > 1 ? 0 : 1);
 }
            @property [digits=['0','1',...,'9']] {number[]} The digits to display (0-9).
            @property [timeSeparator=':'] {string} Separator for time periods in the compact layout.
            @property [isRTL=false] {boolean} True for right-to-left languages, false for left-to-right. */
        regionalOptions: { // Available regional settings, indexed by language/country code
            '': { // Default regional settings - English/US
        labels: ['Years', 'Months', 'Weeks', 'Days', 'Hours', 'Minutes', 'Seconds'],
        labels1: ['Year', 'Month', 'Week', 'Day', 'Hour', 'Minute', 'Second'],
                compactLabels: ['y', 'm', 'w', 'd'],
                whichLabels: null,
                digits: ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9'],
                timeSeparator: ':',
                isRTL: false
            }
        },
        
        /** Names of getter methods - those that can't be chained. */
        _getters: ['getTimes'],

        /* Class name for the right-to-left marker. */
        _rtlClass: pluginName + '-rtl',
        /* Class name for the countdown section marker. */
        _sectionClass: pluginName + '-section',
        /* Class name for the period amount marker. */
        _amountClass: pluginName + '-amount',
        /* Class name for the period name marker. */
        _periodClass: pluginName + '-period',
        /* Class name for the countdown row marker. */
        _rowClass: pluginName + '-row',
        /* Class name for the holding countdown marker. */
        _holdingClass: pluginName + '-holding',
        /* Class name for the showing countdown marker. */
        _showClass: pluginName + '-show',
        /* Class name for the description marker. */
        _descrClass: pluginName + '-descr',

        /* List of currently active countdown elements. */
        _timerElems: [],

        /** Additional setup for the countdown.
            Apply default localisations.
            Create the timer. */
        _init: function() {
            var self = this;
            this._super();
    this._serverSyncs = [];
    var now = (typeof Date.now == 'function' ? Date.now :
        function() { return new Date().getTime(); });
    var perfAvail = (window.performance && typeof window.performance.now == 'function');
    // Shared timer for all countdowns
    function timerCallBack(timestamp) {
        var drawStart = (timestamp < 1e12 ? // New HTML5 high resolution timer
            (perfAvail ? (performance.now() + performance.timing.navigationStart) : now()) :
            // Integer milliseconds since unix epoch
            timestamp || now());
        if (drawStart - animationStartTime >= 1000) {
                    self._updateElems();
            animationStartTime = drawStart;
        }
        requestAnimationFrame(timerCallBack);
    }
    var requestAnimationFrame = window.requestAnimationFrame ||
        window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame ||
        window.oRequestAnimationFrame || window.msRequestAnimationFrame || null;
        // This is when we expect a fall-back to setInterval as it's much more fluid
    var animationStartTime = 0;
    if (!requestAnimationFrame || $.noRequestAnimationFrame) {
        $.noRequestAnimationFrame = null;
                setInterval(function() { self._updateElems(); }, 980); // Fall back to good old setInterval
    }
    else {
        animationStartTime = window.animationStartTime ||
            window.webkitAnimationStartTime || window.mozAnimationStartTime ||
            window.oAnimationStartTime || window.msAnimationStartTime || now();
        requestAnimationFrame(timerCallBack);
    }
        },
    
        /** Convert a date/time to UTC.
            @param tz {number} The hour or minute offset from GMT, e.g. +9, -360.
            @param year {Date|number} the date/time in that timezone or the year in that timezone.
            @param [month] {number} The month (0 - 11) (omit if <code>year</code> is a <code>Date</code>).
            @param [day] {number} The day (omit if <code>year</code> is a <code>Date</code>).
            @param [hours] {number} The hour (omit if <code>year</code> is a <code>Date</code>).
            @param [mins] {number} The minute (omit if <code>year</code> is a <code>Date</code>).
            @param [secs] {number} The second (omit if <code>year</code> is a <code>Date</code>).
            @param [ms] {number} The millisecond (omit if <code>year</code> is a <code>Date</code>).
            @return {Date} The equivalent UTC date/time.
            @example $.countdown.UTCDate(+10, 2013, 12-1, 25, 12, 0)
 $.countdown.UTCDate(-7, new Date(2013, 12-1, 25, 12, 0)) */
    UTCDate: function(tz, year, month, day, hours, mins, secs, ms) {
        if (typeof year == 'object' && year.constructor == Date) {
            ms = year.getMilliseconds();
            secs = year.getSeconds();
            mins = year.getMinutes();
            hours = year.getHours();
            day = year.getDate();
            month = year.getMonth();
            year = year.getFullYear();
        }
        var d = new Date();
        d.setUTCFullYear(year);
        d.setUTCDate(1);
        d.setUTCMonth(month || 0);
        d.setUTCDate(day || 1);
        d.setUTCHours(hours || 0);
        d.setUTCMinutes((mins || 0) - (Math.abs(tz) < 30 ? tz * 60 : tz));
        d.setUTCSeconds(secs || 0);
        d.setUTCMilliseconds(ms || 0);
        return d;
    },

        /** Convert a set of periods into seconds.
       Averaged for months and years.
            @param periods {number[]} The periods per year/month/week/day/hour/minute/second.
            @return {number} The corresponding number of seconds.
            @example var secs = $.countdown.periodsToSeconds(periods) */
    periodsToSeconds: function(periods) {
        return periods[0] * 31557600 + periods[1] * 2629800 + periods[2] * 604800 +
            periods[3] * 86400 + periods[4] * 3600 + periods[5] * 60 + periods[6];
    },

        _instSettings: function(elem, options) {
            return {_periods: [0, 0, 0, 0, 0, 0, 0]};
    },

        /** Add an element to the list of active ones.
            @private
            @param elem {Element} The countdown element. */
        _addElem: function(elem) {
            if (!this._hasElem(elem)) {
                this._timerElems.push(elem);
        }
    },

        /** See if an element is in the list of active ones.
            @private
            @param elem {Element} The countdown element.
            @return {boolean} True if present, false if not. */
        _hasElem: function(elem) {
            return ($.inArray(elem, this._timerElems) > -1);
    },

        /** Remove an element from the list of active ones.
            @private
            @param elem {Element} The countdown element. */
        _removeElem: function(elem) {
            this._timerElems = $.map(this._timerElems,
                function(value) { return (value == elem ? null : value); }); // delete entry
    },

        /** Update each active timer element.
            @private */
        _updateElems: function() {
            for (var i = this._timerElems.length - 1; i >= 0; i--) {
                this._updateCountdown(this._timerElems[i]);
        }
    },

        _optionsChanged: function(elem, inst, options) {
        if (options.layout) {
            options.layout = options.layout.replace(/&lt;/g, '<').replace(/&gt;/g, '>');
        }
        this._resetExtraLabels(inst.options, options);
        var timezoneChanged = (inst.options.timezone != options.timezone);
        $.extend(inst.options, options);
            this._adjustSettings(elem, inst,
            options.until != null || options.since != null || timezoneChanged);
        var now = new Date();
        if ((inst._since && inst._since < now) || (inst._until && inst._until > now)) {
                this._addElem(elem[0]);
        }
            this._updateCountdown(elem, inst);
    },

        /** Redisplay the countdown with an updated display.
            @private
            @param elem {Element|jQuery} The containing division.
            @param inst {object} The current settings for this instance. */
        _updateCountdown: function(elem, inst) {
            elem = elem.jquery ? elem : $(elem);
            inst = inst || elem.data(this.name);
        if (!inst) {
            return;
        }
            elem.html(this._generateHTML(inst)).toggleClass(this._rtlClass, inst.options.isRTL);
        if ($.isFunction(inst.options.onTick)) {
            var periods = inst._hold != 'lap' ? inst._periods :
                this._calculatePeriods(inst, inst._show, inst.options.significant, new Date());
            if (inst.options.tickInterval == 1 ||
                    this.periodsToSeconds(periods) % inst.options.tickInterval == 0) {
                    inst.options.onTick.apply(elem[0], [periods]);
            }
        }
        var expired = inst._hold != 'pause' &&
            (inst._since ? inst._now.getTime() < inst._since.getTime() :
            inst._now.getTime() >= inst._until.getTime());
        if (expired && !inst._expiring) {
            inst._expiring = true;
                if (this._hasElem(elem[0]) || inst.options.alwaysExpire) {
                    this._removeElem(elem[0]);
                if ($.isFunction(inst.options.onExpiry)) {
                        inst.options.onExpiry.apply(elem[0], []);
                }
                if (inst.options.expiryText) {
                    var layout = inst.options.layout;
                    inst.options.layout = inst.options.expiryText;
                        this._updateCountdown(elem[0], inst);
                    inst.options.layout = layout;
                }
                if (inst.options.expiryUrl) {
                    window.location = inst.options.expiryUrl;
                }
            }
            inst._expiring = false;
        }
        else if (inst._hold == 'pause') {
                this._removeElem(elem[0]);
        }
    },

        /** Reset any extra labelsn and compactLabelsn entries if changing labels.
            @private
            @param base {object} The options to be updated.
            @param options {object} The new option values. */
    _resetExtraLabels: function(base, options) {
        var changingLabels = false;
        for (var n in options) {
            if (n != 'whichLabels' && n.match(/[Ll]abels/)) {
                changingLabels = true;
                break;
            }
        }
        if (changingLabels) {
            for (var n in base) { // Remove custom numbered labels
                if (n.match(/[Ll]abels[02-9]|compactLabels1/)) {
                    base[n] = null;
                }
            }
        }
    },
    
        /** Calculate internal settings for an instance.
            @private
            @param elem {jQuery} The containing division.
            @param inst {object} The current settings for this instance.
            @param recalc {boolean} True if until or since are set. */
        _adjustSettings: function(elem, inst, recalc) {
        var now;
        var serverOffset = 0;
        var serverEntry = null;
        for (var i = 0; i < this._serverSyncs.length; i++) {
            if (this._serverSyncs[i][0] == inst.options.serverSync) {
                serverEntry = this._serverSyncs[i][1];
                break;
            }
        }
        if (serverEntry != null) {
            serverOffset = (inst.options.serverSync ? serverEntry : 0);
            now = new Date();
        }
        else {
            var serverResult = ($.isFunction(inst.options.serverSync) ?
                    inst.options.serverSync.apply(elem[0], []) : null);
            now = new Date();
            serverOffset = (serverResult ? now.getTime() - serverResult.getTime() : 0);
            this._serverSyncs.push([inst.options.serverSync, serverOffset]);
        }
        var timezone = inst.options.timezone;
        timezone = (timezone == null ? -now.getTimezoneOffset() : timezone);
        if (recalc || (!recalc && inst._until == null && inst._since == null)) {
            inst._since = inst.options.since;
            if (inst._since != null) {
                inst._since = this.UTCDate(timezone, this._determineTime(inst._since, null));
                if (inst._since && serverOffset) {
                    inst._since.setMilliseconds(inst._since.getMilliseconds() + serverOffset);
                }
            }
            inst._until = this.UTCDate(timezone, this._determineTime(inst.options.until, now));
            if (serverOffset) {
                inst._until.setMilliseconds(inst._until.getMilliseconds() + serverOffset);
            }
        }
        inst._show = this._determineShow(inst);
    },

        /** Remove the countdown widget from a div.
            @param elem {jQuery} The containing division.
            @param inst {object} The current instance object. */
        _preDestroy: function(elem, inst) {
            this._removeElem(elem[0]);
            elem.empty();
    },

        /** Pause a countdown widget at the current time.
       Stop it running but remember and display the current time.
            @param elem {Element} The containing division.
            @example $(selector).countdown('pause') */
        pause: function(elem) {
            this._hold(elem, 'pause');
    },

        /** Pause a countdown widget at the current time.
       Stop the display but keep the countdown running.
            @param elem {Element} The containing division.
            @example $(selector).countdown('lap') */
        lap: function(elem) {
            this._hold(elem, 'lap');
        },

        /** Resume a paused countdown widget.
            @param elem {Element} The containing division.
            @example $(selector).countdown('resume') */
        resume: function(elem) {
            this._hold(elem, null);
        },

        /** Toggle a paused countdown widget.
            @param elem {Element} The containing division.
            @example $(selector).countdown('toggle') */
        toggle: function(elem) {
            var inst = $.data(elem, this.name) || {};
            this[!inst._hold ? 'pause' : 'resume'](elem);
        },

        /** Toggle a lapped countdown widget.
            @param elem {Element} The containing division.
            @example $(selector).countdown('toggleLap') */
        toggleLap: function(elem) {
            var inst = $.data(elem, this.name) || {};
            this[!inst._hold ? 'lap' : 'resume'](elem);
        },

        /** Pause or resume a countdown widget.
            @private
            @param elem {Element} The containing division.
            @param hold {string} The new hold setting. */
        _hold: function(elem, hold) {
            var inst = $.data(elem, this.name);
        if (inst) {
            if (inst._hold == 'pause' && !hold) {
                inst._periods = inst._savePeriods;
                var sign = (inst._since ? '-' : '+');
                inst[inst._since ? '_since' : '_until'] =
                    this._determineTime(sign + inst._periods[0] + 'y' +
                        sign + inst._periods[1] + 'o' + sign + inst._periods[2] + 'w' +
                        sign + inst._periods[3] + 'd' + sign + inst._periods[4] + 'h' + 
                        sign + inst._periods[5] + 'm' + sign + inst._periods[6] + 's');
                    this._addElem(elem);
            }
            inst._hold = hold;
            inst._savePeriods = (hold == 'pause' ? inst._periods : null);
                $.data(elem, this.name, inst);
                this._updateCountdown(elem, inst);
        }
    },

        /** Return the current time periods.
            @param elem {Element} The containing division.
            @return {number[]} The current periods for the countdown.
            @example var periods = $(selector).countdown('getTimes') */
        getTimes: function(elem) {
            var inst = $.data(elem, this.name);
        return (!inst ? null : (inst._hold == 'pause' ? inst._savePeriods : (!inst._hold ? inst._periods :
            this._calculatePeriods(inst, inst._show, inst.options.significant, new Date()))));
    },

        /** A time may be specified as an exact value or a relative one.
            @private
            @param setting {string|number|Date} The date/time value as a relative or absolute value.
            @param defaultTime {Date} The date/time to use if no other is supplied.
            @return {Date} The corresponding date/time. */
    _determineTime: function(setting, defaultTime) {
            var self = this;
        var offsetNumeric = function(offset) { // e.g. +300, -2
            var time = new Date();
            time.setTime(time.getTime() + offset * 1000);
            return time;
        };
        var offsetString = function(offset) { // e.g. '+2d', '-4w', '+3h +30m'
            offset = offset.toLowerCase();
            var time = new Date();
            var year = time.getFullYear();
            var month = time.getMonth();
            var day = time.getDate();
            var hour = time.getHours();
            var minute = time.getMinutes();
            var second = time.getSeconds();
            var pattern = /([+-]?[0-9]+)\s*(s|m|h|d|w|o|y)?/g;
            var matches = pattern.exec(offset);
            while (matches) {
                switch (matches[2] || 's') {
                    case 's': second += parseInt(matches[1], 10); break;
                    case 'm': minute += parseInt(matches[1], 10); break;
                    case 'h': hour += parseInt(matches[1], 10); break;
                    case 'd': day += parseInt(matches[1], 10); break;
                    case 'w': day += parseInt(matches[1], 10) * 7; break;
                    case 'o':
                        month += parseInt(matches[1], 10); 
                            day = Math.min(day, self._getDaysInMonth(year, month));
                        break;
                    case 'y':
                        year += parseInt(matches[1], 10);
                            day = Math.min(day, self._getDaysInMonth(year, month));
                        break;
                }
                matches = pattern.exec(offset);
            }
            return new Date(year, month, day, hour, minute, second, 0);
        };
        var time = (setting == null ? defaultTime :
            (typeof setting == 'string' ? offsetString(setting) :
            (typeof setting == 'number' ? offsetNumeric(setting) : setting)));
        if (time) time.setMilliseconds(0);
        return time;
    },

        /** Determine the number of days in a month.
            @private
            @param year {number} The year.
            @param month {number} The month.
            @return {number} The days in that month. */
    _getDaysInMonth: function(year, month) {
        return 32 - new Date(year, month, 32).getDate();
    },

        /** Default implementation to determine which set of labels should be used for an amount.
            Use the <code>labels</code> attribute with the same numeric suffix (if it exists).
            @private
            @param num {number} The amount to be displayed.
            @return {number} The set of labels to be used for this amount. */
    _normalLabels: function(num) {
        return num;
    },

        /** Generate the HTML to display the countdown widget.
            @private
            @param inst {object} The current settings for this instance.
            @return {string} The new HTML for the countdown display. */
    _generateHTML: function(inst) {
        var self = this;
        // Determine what to show
        inst._periods = (inst._hold ? inst._periods :
            this._calculatePeriods(inst, inst._show, inst.options.significant, new Date()));
        // Show all 'asNeeded' after first non-zero value
        var shownNonZero = false;
        var showCount = 0;
        var sigCount = inst.options.significant;
        var show = $.extend({}, inst._show);
        for (var period = Y; period <= S; period++) {
            shownNonZero |= (inst._show[period] == '?' && inst._periods[period] > 0);
            show[period] = (inst._show[period] == '?' && !shownNonZero ? null : inst._show[period]);
            showCount += (show[period] ? 1 : 0);
            sigCount -= (inst._periods[period] > 0 ? 1 : 0);
        }
        var showSignificant = [false, false, false, false, false, false, false];
        for (var period = S; period >= Y; period--) { // Determine significant periods
            if (inst._show[period]) {
                if (inst._periods[period]) {
                    showSignificant[period] = true;
                }
                else {
                    showSignificant[period] = sigCount > 0;
                    sigCount--;
                }
            }
        }
        var labels = (inst.options.compact ? inst.options.compactLabels : inst.options.labels);
        var whichLabels = inst.options.whichLabels || this._normalLabels;
        var showCompact = function(period) {
            var labelsNum = inst.options['compactLabels' + whichLabels(inst._periods[period])];
            return (show[period] ? self._translateDigits(inst, inst._periods[period]) +
                (labelsNum ? labelsNum[period] : labels[period]) + ' ' : '');
        };
        var minDigits = (inst.options.padZeroes ? 2 : 1);
        var showFull = function(period) {
            var labelsNum = inst.options['labels' + whichLabels(inst._periods[period])];
            return ((!inst.options.significant && show[period]) ||
                (inst.options.significant && showSignificant[period]) ?
                    '<span class="' + self._sectionClass + '">' +
                    '<span class="' + self._amountClass + '">' +
                self._minDigits(inst, inst._periods[period], minDigits) + '</span>' +
                '<span class="' + self._periodClass + '">' +
                (labelsNum ? labelsNum[period] : labels[period]) + '</span></span>' : '');
        };
        return (inst.options.layout ? this._buildLayout(inst, show, inst.options.layout,
            inst.options.compact, inst.options.significant, showSignificant) :
            ((inst.options.compact ? // Compact version
            '<span class="' + this._rowClass + ' ' + this._amountClass +
            (inst._hold ? ' ' + this._holdingClass : '') + '">' + 
            showCompact(Y) + showCompact(O) + showCompact(W) + showCompact(D) + 
            (show[H] ? this._minDigits(inst, inst._periods[H], 2) : '') +
            (show[M] ? (show[H] ? inst.options.timeSeparator : '') +
            this._minDigits(inst, inst._periods[M], 2) : '') +
            (show[S] ? (show[H] || show[M] ? inst.options.timeSeparator : '') +
            this._minDigits(inst, inst._periods[S], 2) : '') :
            // Full version
            '<span class="' + this._rowClass + ' ' + this._showClass + (inst.options.significant || showCount) +
            (inst._hold ? ' ' + this._holdingClass : '') + '">' +
            showFull(Y) + showFull(O) + showFull(W) + showFull(D) +
            showFull(H) + showFull(M) + showFull(S)) + '</span>' +
            (inst.options.description ? '<span class="' + this._rowClass + ' ' + this._descrClass + '">' +
            inst.options.description + '</span>' : '')));
    },

        /** Construct a custom layout.
            @private
            @param inst {object} The current settings for this instance.
            @param show {boolean[]} Flags indicating which periods are requested.
            @param layout {string} The customised layout.
            @param compact {boolean} True if using compact labels.
            @param significant {number} The number of periods with values to show, zero for all.
            @param showSignificant {boolean[]} Other periods to show for significance.
            @return {string} The custom HTML. */
    _buildLayout: function(inst, show, layout, compact, significant, showSignificant) {
        var labels = inst.options[compact ? 'compactLabels' : 'labels'];
        var whichLabels = inst.options.whichLabels || this._normalLabels;
        var labelFor = function(index) {
            return (inst.options[(compact ? 'compactLabels' : 'labels') +
                whichLabels(inst._periods[index])] || labels)[index];
        };
        var digit = function(value, position) {
            return inst.options.digits[Math.floor(value / position) % 10];
        };
        var subs = {desc: inst.options.description, sep: inst.options.timeSeparator,
            yl: labelFor(Y), yn: this._minDigits(inst, inst._periods[Y], 1),
            ynn: this._minDigits(inst, inst._periods[Y], 2),
            ynnn: this._minDigits(inst, inst._periods[Y], 3), y1: digit(inst._periods[Y], 1),
            y10: digit(inst._periods[Y], 10), y100: digit(inst._periods[Y], 100),
            y1000: digit(inst._periods[Y], 1000),
            ol: labelFor(O), on: this._minDigits(inst, inst._periods[O], 1),
            onn: this._minDigits(inst, inst._periods[O], 2),
            onnn: this._minDigits(inst, inst._periods[O], 3), o1: digit(inst._periods[O], 1),
            o10: digit(inst._periods[O], 10), o100: digit(inst._periods[O], 100),
            o1000: digit(inst._periods[O], 1000),
            wl: labelFor(W), wn: this._minDigits(inst, inst._periods[W], 1),
            wnn: this._minDigits(inst, inst._periods[W], 2),
            wnnn: this._minDigits(inst, inst._periods[W], 3), w1: digit(inst._periods[W], 1),
            w10: digit(inst._periods[W], 10), w100: digit(inst._periods[W], 100),
            w1000: digit(inst._periods[W], 1000),
            dl: labelFor(D), dn: this._minDigits(inst, inst._periods[D], 1),
            dnn: this._minDigits(inst, inst._periods[D], 2),
            dnnn: this._minDigits(inst, inst._periods[D], 3), d1: digit(inst._periods[D], 1),
            d10: digit(inst._periods[D], 10), d100: digit(inst._periods[D], 100),
            d1000: digit(inst._periods[D], 1000),
            hl: labelFor(H), hn: this._minDigits(inst, inst._periods[H], 1),
            hnn: this._minDigits(inst, inst._periods[H], 2),
            hnnn: this._minDigits(inst, inst._periods[H], 3), h1: digit(inst._periods[H], 1),
            h10: digit(inst._periods[H], 10), h100: digit(inst._periods[H], 100),
            h1000: digit(inst._periods[H], 1000),
            ml: labelFor(M), mn: this._minDigits(inst, inst._periods[M], 1),
            mnn: this._minDigits(inst, inst._periods[M], 2),
            mnnn: this._minDigits(inst, inst._periods[M], 3), m1: digit(inst._periods[M], 1),
            m10: digit(inst._periods[M], 10), m100: digit(inst._periods[M], 100),
            m1000: digit(inst._periods[M], 1000),
            sl: labelFor(S), sn: this._minDigits(inst, inst._periods[S], 1),
            snn: this._minDigits(inst, inst._periods[S], 2),
            snnn: this._minDigits(inst, inst._periods[S], 3), s1: digit(inst._periods[S], 1),
            s10: digit(inst._periods[S], 10), s100: digit(inst._periods[S], 100),
            s1000: digit(inst._periods[S], 1000)};
        var html = layout;
        // Replace period containers: {p<}...{p>}
        for (var i = Y; i <= S; i++) {
            var period = 'yowdhms'.charAt(i);
            var re = new RegExp('\\{' + period + '<\\}([\\s\\S]*)\\{' + period + '>\\}', 'g');
            html = html.replace(re, ((!significant && show[i]) ||
                (significant && showSignificant[i]) ? '$1' : ''));
        }
        // Replace period values: {pn}
        $.each(subs, function(n, v) {
            var re = new RegExp('\\{' + n + '\\}', 'g');
            html = html.replace(re, v);
        });
        return html;
    },

        /** Ensure a numeric value has at least n digits for display.
            @private
            @param inst {object} The current settings for this instance.
            @param value {number} The value to display.
            @param len {number} The minimum length.
            @return {string} The display text. */
    _minDigits: function(inst, value, len) {
        value = '' + value;
        if (value.length >= len) {
            return this._translateDigits(inst, value);
        }
        value = '0000000000' + value;
        return this._translateDigits(inst, value.substr(value.length - len));
    },

        /** Translate digits into other representations.
            @private
            @param inst {object} The current settings for this instance.
            @param value {string} The text to translate.
            @return {string} The translated text. */
    _translateDigits: function(inst, value) {
        return ('' + value).replace(/[0-9]/g, function(digit) {
                return inst.options.digits[digit];
            });
    },

        /** Translate the format into flags for each period.
            @private
            @param inst {object} The current settings for this instance.
            @return {string[]} Flags indicating which periods are requested (?) or
                    required (!) by year, month, week, day, hour, minute, second. */
    _determineShow: function(inst) {
        var format = inst.options.format;
        var show = [];
        show[Y] = (format.match('y') ? '?' : (format.match('Y') ? '!' : null));
        show[O] = (format.match('o') ? '?' : (format.match('O') ? '!' : null));
        show[W] = (format.match('w') ? '?' : (format.match('W') ? '!' : null));
        show[D] = (format.match('d') ? '?' : (format.match('D') ? '!' : null));
        show[H] = (format.match('h') ? '?' : (format.match('H') ? '!' : null));
        show[M] = (format.match('m') ? '?' : (format.match('M') ? '!' : null));
        show[S] = (format.match('s') ? '?' : (format.match('S') ? '!' : null));
        return show;
    },
    
        /** Calculate the requested periods between now and the target time.
            @private
            @param inst {object} The current settings for this instance.
            @param show {string[]} Flags indicating which periods are requested/required.
            @param significant {number} The number of periods with values to show, zero for all.
            @param now {Date} The current date and time.
            @return {number[]} The current time periods (always positive)
                    by year, month, week, day, hour, minute, second. */
    _calculatePeriods: function(inst, show, significant, now) {
        // Find endpoints
        inst._now = now;
        inst._now.setMilliseconds(0);
        var until = new Date(inst._now.getTime());
        if (inst._since) {
            if (now.getTime() < inst._since.getTime()) {
                inst._now = now = until;
            }
            else {
                now = inst._since;
            }
        }
        else {
            until.setTime(inst._until.getTime());
            if (now.getTime() > inst._until.getTime()) {
                inst._now = now = until;
            }
        }
        // Calculate differences by period
        var periods = [0, 0, 0, 0, 0, 0, 0];
        if (show[Y] || show[O]) {
            // Treat end of months as the same
                var lastNow = this._getDaysInMonth(now.getFullYear(), now.getMonth());
                var lastUntil = this._getDaysInMonth(until.getFullYear(), until.getMonth());
            var sameDay = (until.getDate() == now.getDate() ||
                (until.getDate() >= Math.min(lastNow, lastUntil) &&
                now.getDate() >= Math.min(lastNow, lastUntil)));
            var getSecs = function(date) {
                return (date.getHours() * 60 + date.getMinutes()) * 60 + date.getSeconds();
            };
            var months = Math.max(0,
                (until.getFullYear() - now.getFullYear()) * 12 + until.getMonth() - now.getMonth() +
                ((until.getDate() < now.getDate() && !sameDay) ||
                (sameDay && getSecs(until) < getSecs(now)) ? -1 : 0));
            periods[Y] = (show[Y] ? Math.floor(months / 12) : 0);
            periods[O] = (show[O] ? months - periods[Y] * 12 : 0);
            // Adjust for months difference and end of month if necessary
            now = new Date(now.getTime());
            var wasLastDay = (now.getDate() == lastNow);
                var lastDay = this._getDaysInMonth(now.getFullYear() + periods[Y],
                now.getMonth() + periods[O]);
            if (now.getDate() > lastDay) {
                now.setDate(lastDay);
            }
            now.setFullYear(now.getFullYear() + periods[Y]);
            now.setMonth(now.getMonth() + periods[O]);
            if (wasLastDay) {
                now.setDate(lastDay);
            }
        }
        var diff = Math.floor((until.getTime() - now.getTime()) / 1000);
        var extractPeriod = function(period, numSecs) {
            periods[period] = (show[period] ? Math.floor(diff / numSecs) : 0);
            diff -= periods[period] * numSecs;
        };
        extractPeriod(W, 604800);
        extractPeriod(D, 86400);
        extractPeriod(H, 3600);
        extractPeriod(M, 60);
        extractPeriod(S, 1);
        if (diff > 0 && !inst._since) { // Round up if left overs
            var multiplier = [1, 12, 4.3482, 7, 24, 60, 60];
            var lastShown = S;
            var max = 1;
            for (var period = S; period >= Y; period--) {
                if (show[period]) {
                    if (periods[lastShown] >= max) {
                        periods[lastShown] = 0;
                        diff = 1;
                    }
                    if (diff > 0) {
                        periods[period]++;
                        diff = 0;
                        lastShown = period;
                        max = 1;
                    }
                }
                max *= multiplier[period];
            }
        }
        if (significant) { // Zero out insignificant periods
            for (var period = Y; period <= S; period++) {
                if (significant && periods[period]) {
                    significant--;
                }
                else if (!significant) {
                    periods[period] = 0;
                }
            }
        }
        return periods;
    }
    });

})(jQuery);
